单项选择题
If the bedplate was too rigid, then as the hull flexed, the （）, which secure the engine into the ship would be likely to break, and there would be a danger of the bedplate cracking.
A.through bolts B.jack bolts C.holding down bolts D.tap bolts
单项选择题 The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.
单项选择题 The fire drill must, as far as practicable, be conducted if （）.
单项选择题 （）, the second one will start automatically.
